how bad is a B+ in Calc BC for Wharton?

I have a 3.95 unweighted GPA, am taking a very rigorous courseload, and have amazing business EC’s, but the Calc BC class at my school is brutal. I am extremely confident that I will get a 5 on the test but am afraid of my grade slipping down to a B+. Would this be a big deal when applying to a place as math-oriented as Wharton?

I also got a 770 on Math II and a 780 on Math for my SAT.